client-go: remove openstack auth plugin

staging/src/k8s.io/client-go/go.mod

@@ -17,7 +17,6 @@ require (
 	github.com/google/gofuzz v1.1.0
 	github.com/google/uuid v1.1.1
 	github.com/googleapis/gnostic v0.1.0
-	github.com/gophercloud/gophercloud v0.1.0
 	github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7
 	github.com/imdario/mergo v0.3.5
 	github.com/peterbourgon/diskv v2.0.1+incompatible

staging/src/k8s.io/client-go/plugin/pkg/client/auth/openstack/BUILD

@@ -3,25 +3,15 @@ package(default_visibility = ["//visibility:public"])
 load(
     "@io_bazel_rules_go//go:def.bzl",
     "go_library",
-    "go_test",
-)
-
-go_test(
-    name = "go_default_test",
-    srcs = ["openstack_test.go"],
-    embed = [":go_default_library"],
 )
 
 go_library(
     name = "go_default_library",
-    srcs = ["openstack.go"],
+    srcs = ["openstack_stub.go"],
     importmap = "k8s.io/kubernetes/vendor/k8s.io/client-go/plugin/pkg/client/auth/openstack",
     importpath = "k8s.io/client-go/plugin/pkg/client/auth/openstack",
     deps = [
-        "//staging/src/k8s.io/apimachinery/pkg/util/net:go_default_library",
         "//staging/src/k8s.io/client-go/rest:go_default_library",
-        "//vendor/github.com/gophercloud/gophercloud:go_default_library",
-        "//vendor/github.com/gophercloud/gophercloud/openstack:go_default_library",
         "//vendor/k8s.io/klog:go_default_library",
     ],
 )

staging/src/k8s.io/client-go/plugin/pkg/client/auth/openstack/openstack_stub.go

@@ -0,0 +1,36 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package openstack
+
+import (
+	"errors"
+
+	"k8s.io/client-go/rest"
+	"k8s.io/klog"
+)
+
+func init() {
+	if err := rest.RegisterAuthProviderPlugin("openstack", newOpenstackAuthProvider); err != nil {
+		klog.Fatalf("Failed to register openstack auth plugin: %s", err)
+	}
+}
+
+func newOpenstackAuthProvider(_ string, _ map[string]string, _ rest.AuthProviderConfigPersister) (rest.AuthProvider, error) {
+	return nil, errors.New(`The openstack auth plugin has been removed.
+Please use the "client-keystone-auth" kubectl/client-go credential plugin instead.
+See https://github.com/kubernetes/cloud-provider-openstack/blob/master/docs/using-client-keystone-auth.md for further details`)
+}